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alsa-2024:2368
Vulnerability from osv_almalinux
Published
2024-04-30 00:00
Modified
2024-05-07 15:03
Summary
Moderate: mod_http2 security update
Details
The mod_http2 Apache httpd module implements the HTTP2 protocol (h2+h2c) on top of libnghttp2 for httpd 2.4 servers.
Security Fix(es):
- httpd: mod_http2: DoS in HTTP/2 with initial window size 0 (CVE-2023-43622)
- mod_http2: reset requests exhaust memory (incomplete fix of CVE-2023-44487) (CVE-2023-45802)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Additional Changes:
For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.
References
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CVE-2023-45802 (GCVE-0-2023-45802)
Vulnerability from cvelistv5 – Published: 2023-10-23 06:50 – Updated: 2024-10-14 09:01
VLAI?
EPSS
Title
Apache HTTP Server: HTTP/2 stream memory not reclaimed right away on RST
Summary
When a HTTP/2 stream was reset (RST frame) by a client, there was a time window were the request's memory resources were not reclaimed immediately. Instead, de-allocation was deferred to connection close. A client could send new requests and resets, keeping the connection busy and open and causing the memory footprint to keep on growing. On connection close, all resources were reclaimed, but the process might run out of memory before that.
This was found by the reporter during testing of CVE-2023-44487 (HTTP/2 Rapid Reset Exploit) with their own test client. During "normal" HTTP/2 use, the probability to hit this bug is very low. The kept memory would not become noticeable before the connection closes or times out.
Users are recommended to upgrade to version 2.4.58, which fixes the issue.
Severity ?
No CVSS data available.
CWE
- CWE-404 - Improper Resource Shutdown or Release
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server |
Affected:
2.4.17 , ≤ 2.4.57
(semver)
|
Credits
Will Dormann of Vul Labs
David Warren of Vul Labs
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CVE-2023-44487 (GCVE-0-2023-44487)
Vulnerability from cvelistv5 – Published: 2023-10-10 00:00 – Updated: 2025-11-04 21:08
VLAI?
EPSS
Summary
The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.
Severity ?
7.5 (High)
CWE
- n/a
Assigner
References
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"dateUpdated": "2025-11-04T21:08:27.383Z",
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CVE-2023-43622 (GCVE-0-2023-43622)
Vulnerability from cvelistv5 – Published: 2023-10-23 06:50 – Updated: 2025-02-13 17:13
VLAI?
EPSS
Title
Apache HTTP Server: DoS in HTTP/2 with initial windows size 0
Summary
An attacker, opening a HTTP/2 connection with an initial window size of 0, was able to block handling of that connection indefinitely in Apache HTTP Server. This could be used to exhaust worker resources in the server, similar to the well known "slow loris" attack pattern.
This has been fixed in version 2.4.58, so that such connection are terminated properly after the configured connection timeout.
This issue affects Apache HTTP Server: from 2.4.55 through 2.4.57.
Users are recommended to upgrade to version 2.4.58, which fixes the issue.
Severity ?
No CVSS data available.
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
| URL | Tags | |
|---|---|---|
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server |
Affected:
2.4.55 , ≤ 2.4.57
(semver)
|
Credits
Prof. Sven Dietrich (City University of New York)
Isa Jafarov (City University of New York)
Prof. Heejo Lee (Korea University)
Choongin Lee (Korea University)
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"value": "Isa Jafarov (City University of New York)"
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"lang": "en",
"time": "2023-09-15T09:51:00.000Z",
"value": "reported"
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"dateReserved": "2023-09-20T07:45:21.299Z",
"dateUpdated": "2025-02-13T17:13:24.282Z",
"state": "PUBLISHED"
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}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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